The extended 29-bit identifier (CAN 2.0B) is identical, but has a longer ID and is usually used within the j1939 protocol – heavy-duty autos. The next one is the cyclic redundancy verify , which is a 16-bit checksum that detects errors and points in the transmitted data. The picture under reveals a typical CAN frame with an 11-bit identification, which is the type used Automotive News in most cars. Except for the bigger ID, the expanded 29-bit identifier frame is equivalent. High-priority information will get prioritized by ID, to get quick bus entry – not interrupting other frames. When the CAN protocol was created, its objective was to enable quick communication between electronic gadgets and modules, whereas lowering errors, weight, wiring, and costs.
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